Speaker
Description
The search for Higgs boson pair production (HH) is a key step toward probing the Higgs potential and measuring the Higgs boson self-coupling in the Standard Model. The HH → bbττ channel provides strong sensitivity thanks to its relatively large branching fraction and a background composition that can be controlled with dedicated selections. This work focuses on the lepton–hadron (ℓτ_had) final state, where one τ decays leptonically and the other hadronically. A major experimental challenge in this channel is the estimation of fake-τ backgrounds, dominated by t\bar{t} with additional contributions from multijet production. We present a data-driven strategy to estimate fake-τ contributions using dedicated control regions to derive fake factors, with validation using simulation and alternative cross-check methods. We also discuss improvements to the background modelling to ensure robust signal extraction in challenging phase-space regions. These developments enhance the overall sensitivity of the HH → bbττ (ℓτ_had) analysis and contribute to more precise constraints on Higgs boson self-interactions.
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